add PCI id for Intel 82801EB/ER ATA chipset as used in an HP WX4100 desktop.

Reference: /n/sources/patch/applied/another-sdata-picid
Date: Thu Aug  4 17:48:29 CES 2011
Signed-off-by: steve@quintile.net

--- /sys/src/9/pc/sdata.c	Thu Aug  4 17:47:48 2011
+++ /sys/src/9/pc/sdata.c	Thu Aug  4 17:47:38 2011
@@ -2033,6 +2033,7 @@
 		case (0x244B<<16)|0x8086:	/* 82801BA (ICH2, High-End) */
 		case (0x248A<<16)|0x8086:	/* 82801CA (ICH3, Mobile) */
 		case (0x248B<<16)|0x8086:	/* 82801CA (ICH3, High-End) */
+		case (0x24D1<<16)|0x8086:	/* 82801EB/ER (ICH5 High-End) */
 		case (0x24CA<<16)|0x8086:	/* 82801DBM (ICH4, Mobile) */
 		case (0x24CB<<16)|0x8086:	/* 82801DB (ICH4, High-End) */
 		case (0x24DB<<16)|0x8086:	/* 82801EB (ICH5) */